US7525286B2 - Method and device for vehicle battery protection with battery power source noise pattern analysis - Google Patents
Method and device for vehicle battery protection with battery power source noise pattern analysis Download PDFInfo
- Publication number
- US7525286B2 US7525286B2 US11/318,621 US31862105A US7525286B2 US 7525286 B2 US7525286 B2 US 7525286B2 US 31862105 A US31862105 A US 31862105A US 7525286 B2 US7525286 B2 US 7525286B2
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- battery
- voltage
- power
- noise
- power management
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/46—The network being an on-board power network, i.e. within a vehicle for ICE-powered road vehicles
Definitions
- the present invention relates to a method and device for vehicle battery protection, especially to a method and device for vehicle battery protection with battery power source noise pattern analysis that manages power consumption and battery power, being applied through circuit design.
- the present invention is applied for safety management of vehicle batteries with an engine starter and a charging device.
- Power supply for vehicles makes much of accuracy and safety.
- One of the most important purposes of power supply system is to supply vehicles and users stable, adequate and convenient electricity.
- the power consumption of vehicles is getting complicated because after the vehicle stops running, the batteries still supply power to electric appliances such as notebooks, book lights, audio devices, air conditioners, microwaves, and refrigerators, etc. Or the user may forget turn off head lamps so that the power exhaust after a period of time.
- the electric starting device of the vehicle such as starts requires certain voltage and current for starting the vehicle engine, thus further driving the generator. When the power exhausted or the voltage and current are lower than the requirements, the starting device of engine can't operate normally so that the vehicle engine can't be started. This leads to safety problem and inconvenience on usage.
- the present invention provides a device that connects with a battery power source cable in parallel, without obtain vehicle status from vehicle control system, analyzes noise of vehicle starting device and electric appliances in frequency pattern for recognition of power consumption, and manages as well as protects battery power after the vehicle engine being turned off.
- the present invention detects voltages, currents, and noises introduced by operation of the vehicle engine and peripherals and runs pattern analysis and identification by the features of the detected voltages, currents, and noises for protecting and managing the batteries.
- the device judges whether the vehicle engine and generator are turned on normally while there is not power consumed by other electric appliances, then start charging the battery sets.
- the battery power management is started to judge whether the vehicle stops normally, the power consumption is normal or abnormal.
- the device manages power cutoff or supplying by the main batter as well as the backup battery, displays status or shows warnings of the batteries states, and protect and ensure safety of the main battery as well as the backup battery.
- Different power frequency pattern composed by the currents, voltages and noises are used to check vehicle status and manage battery power after being analyzed.
- the present invention prevents the power exhaustion that causes difficulties of restarting, protects vehicle batteries, and improves electrical safety of vehicles.
- the main power source is switched between the main battery and the backup battery for convenience of users.
- FIG. 1 is a schematic drawing of a battery protection device in accordance with the present invention
- FIG. 2A is an embodiment of high frequency noise generated by electric appliances on vehicles
- FIG. 2B is an embodiment of nominal frequency noise generated by electric appliances on vehicles
- FIG. 2C is another embodiment of nominal frequency noise generated by electric appliances on vehicles
- FIG. 2D is an embodiment of low frequency noise generated by electric appliances on vehicles
- FIG. 2E is an embodiment of one-time noise generated by electric appliances on vehicles
- FIG. 3 is a schematic drawing of a noise receive and measure circuit in accordance with the present invention.
- FIG. 4A is a main flow chart of a method for vehicle battery protection with battery power source noise pattern analysis in accordance with the present invention
- FIG. 4B is a flow chart of a first process of a method for vehicle battery protection with battery power source noise pattern analysis in accordance with the present invention
- FIG. 4C is a flow chart of a second process of a method for vehicle battery protection with battery power source noise pattern analysis in accordance with the present invention.
- FIG. 4D is a flow chart of a third process of a method for vehicle battery protection with battery power source noise pattern analysis in accordance with the present invention.
- FIG. 4E is a flow chart of a fourth process of a method for vehicle battery protection with battery power source noise pattern analysis in accordance with the present invention.
- the method analyzes power signals from power source only, without input the vehicles control signals. Under the limited information input, the method judges whether a vehicle engine operating normally or already stop by using the power source, so as to employ correctly strategy for battery protection and power management. While power consumption by vehicle or outside device 4 , the voltage and current of main battery set 1 and the backup battery set 2 will rapid change or reduction, thus the change of the voltage and current can't confirm that vehicles turn on normally, or the engine is off. The main cause of the fact that the change or reduction may introduced by various outside device 4 and vehicle electric devices, such as notebooks, cellular phones, book lights, audio devices, air conditioners, microwaves, refrigerators, car alarm and flash light, etc. When these electronics are in use, the voltage as well as the current varies dramatically.
- the method for battery power source noise pattern analysis of the present invention takes samples of voltage as well as current from the main battery, the backup battery and vehicle, during periodically sampling time. According to specific sampling interval, compare sample noise pattern with the noise pattern of reference voltage and reference current of the main battery.
- the reference voltage and reference current of the backup battery, and reference background noise are said as reference noise pattern.
- the voltage and current of the main battery, the voltage and current of the backup battery, noise introduced from running vehicle is to compare with the reference noise.
- the engine works, noises generated from the main battery voltage, current, the backup battery voltage, current and voltage noise by the running of the vehicle engine.
- the noise pattern is compared and analysis of different frequencies and waveform, it can identify that whether the vehicle engine running normally or turned off.
- the suitable of sampling time interval is relative and whether the necessary noise information is obtained, and directly correlated with each other.
- the present invention provide the pattern analysis by sampling noises introduced by the main battery voltage, the backup battery voltage and current, and the vehicle generator noise only.
- the purpose of vehicle battery protect device can reserve power for restart vehicle engine. This is a feature of the present invention.
- the method for checking that the vehicle engine starts supplying power and charging the batteries is comparing the frequency pattern of the noise introduced by the generator being turned on by the vehicle engine.
- the first necessary condition of the frequency pattern is checking the noise introduced from the vehicle engine operates. In an embodiment of the present invention, under the proper sampling period, the preferred samples are successful been identified matching the frequency characteristics, then result that the engine been restart. The proper sampling period said, 5 to 10 continuous sampling noise. If there is one sample noise not satisfied with above condition, re-sample the noise.
- the second necessary condition of the frequency pattern is checking the voltage of the vehicle main battery. In an embodiment of the present invention, the preferred sampling is that the vehicle battery voltage is higher than the second voltage V H on successive 3 to 8 continuous sampling time. If there is one sample not satisfied with above condition, re-sample the noise. When both the first and the second necessary condition are satisfied, it is identified that the vehicle engine starts the generator to provide power and takes the reset for charging the main battery and the backup battery.
- the method for checking that the vehicle engine stops supplying power and stop to charge the batteries is comparing the frequency pattern of the noise introduced by the generator being turned off by the vehicle engine.
- the first necessary condition of the frequency pattern is that: if the vehicle shut-down, the generator stop to charge the main battery and backup battery. At this moment, continuously detect voltage and current of vehicle batteries as well as voltage noise from the vehicle generator. When the vehicle stops and the engine is off, there is no more voltage noise of the vehicle generator introduced.
- the proper sampling time depends on the noise introduced. In an embodiment of the present invention, the preferred sampling is that on successive 5 to 10 continuous sampling time. For all sampling time, the sample noises are not matching the frequency characteristics, then the vehicle engine stop. If there is one sample not satisfied with above condition, re-sample the noise.
- the second necessary condition of the frequency pattern is checking the voltage of the vehicle main battery.
- the preferred sampling is that the vehicle battery voltage is lower than the second voltage V H on successive 3 to 8 continuous sampling time. If there is one sample not satisfied with above condition, re-sample the noise. When both the first and the second necessary condition are satisfied, it is identified that the vehicle engine stops, the generator does not provide power. The power supply turns from the main battery.
- a method is for management the main battery. There are two conditions of checking whether the main battery should be cutoff the supplying power to outside device and reserve enough battery energy for vehicle restart.
- the first condition accords to the preset time for supplying power. When the time is up, this condition is satisfied.
- the second condition is that the voltage of the main battery is lower than the first voltage V L . Once one of the two conditions is satisfied, the power from the main battery is cut off and the circuit is connected to the backup battery for power supply continuously.
- the preset time for power supply is set and adjusted in accordance with the battery capacity, power consumption of vehicle outside device, and the electricity need for starting vehicles.
- a method is for management the backup battery. Checking whether the backup battery should be cut off supplying power to outside device is in condition that the voltage of the backup battery is lower than the first voltage V L , then cut off the power supply from the backup battery.
- an over voltage protector 311 prevents components of circuitry from damaging caused by over voltage of the battery and outputs signals to an output controller 342 for generating signals of cutting off or connecting with power so as to cut off or connect with power from the battery.
- a low voltage protector 312 prevents battery ageing or abnormal caused by low voltage and outputs signals to an output controller 342 for generating signals of cutting off or connecting with power so as to cut off or connect with power from the battery.
- a polar protector 313 is used to protect components when the polarity of the battery is connected in reverse direction.
- a short protector 314 prevents the battery protection device being fried when there is a short happened.
- a source characteristic sensing unit 32 includes a sampling time circuit 321 that sets different sampling time for different receive and measure circuit, a voltage receive and measure circuit 322 for the main battery 1 , a current receive and measure circuit 323 for the backup battery 2 , and a noise receive and measure circuit 324 for a power source of vehicle generator.
- the voltage receive and measure circuit 322 of the main battery 1 detects voltage of the vehicle main battery 1 once at a specific sampling time and the result is input into an input end of a frequency analyzer 331 of an source characteristic receive and measure unit 33 .
- the current receive and measure circuit 323 of the backup battery 2 detects current of the vehicle backup battery 2 once at a specific sampling time and the result is input into an input end of a frequency analyzer 331 of an source characteristic receive and measure unit 33 .
- the noise receive and measure circuit 324 detects noise generated from the vehicle generator once at a specific sampling time, then the result is amplified, and is input into an input end of a frequency analyzer 331 of an source characteristic receive and measure unit 33
- the present invention has no vehicle noise sensor, temperature sensor and without getting information from vehicle control computer.
- a noise receive and measure circuit 324 on an end of battery power is developed to get power source noise generated by operation of the vehicle engine.
- the power source noise pattern is classified into four types.
- the first type is high-frequency noise, with frequency ranging from 1 ⁇ s to 1 ms such as noise generated by DC-DC notebooks or cellular phones, as shown in FIG. 2A .
- the second type is middle-frequency noise, with frequency ranging from 1 ms to 100 ms such as 20 ms noise generated by the vehicle generator while starting, as shown in FIG.
- the third type is low-frequency noise, with frequency ranging from 500 ms to several seconds such as noise generated by blinking vehicle lamps, as shown in FIG. 2D .
- the fourth type is one-time noise, such as noise generated by a remote controller or turning on lights inside the vehicle, as shown in FIG. 2E .
- the noise receive and measure circuit 324 consists of a noise input end for sensing voltage of the power source, then the voltage value is compared with the preset voltage reference value, being amplified by an amplifier to generate oscillator waveform and to filter out background noise, said the characteristic value of power source noise.
- the characteristic value of power source noise with feature of sensing noise ranging from milliseconds to seconds is output by a signal processor. Through the circuit, the characteristic value is sent to frequency analyzer 331 for pattern analysis.
- the noise receive and measure circuit 324 including a pulse waveform noise detection circuit of the present invention is used, as shown in FIG. 3 .
- the main function of the pulse waveform noise detection circuit is to detect small amplitude noise of the main battery, compare it with reference voltage to generate oscillator waveform. After filtering, the oscillator waveform is phased into DC waveform and then being input into the frequency analyzer 331 .
- noise generated by starting of the generator can be measured and identified correctly through the noise receive and measure circuit 324 and the frequency analyzer frequency analyzer 331 of the source characteristic receive and measure unit 33 , it is necessary to have a further checking pattern in order to avoid mistakes caused by interference.
- the vehicle engine is turned on and started the generator, the battery is charged.
- the source characteristic receive and measure unit 33 includes the frequency analyzer 331 that receives characteristic values of voltage, current and noise for analysis.
- the frequency analyzer 331 filters the received noise for checking whether the generator is started and receives signals of voltage and current to generate digital signals.
- a pattern igniter 332 that receives results from the frequency analyzer 331 and generates pattern of vehicle power status is used to compare digital signals output from the frequency analyzer 331 so as to generate different combinations and driving signals of operations of vehicles and status of the main battery as well as the backup battery.
- a power management part 333 that generates strategy for power management according to pattern of vehicle power status is used to receive various driving signals and output signals for managing power to an actuator unit 34 so as to cut off or connect with the main battery as well as the backup battery.
- the power management 333 also outputs signals to an alarm/display unit 35 for generating different combinations of lights and sounds with various frequencies.
- the pattern igniter 332 when the pattern igniter 332 outputs a signal showing that the voltage of the main battery 1 is lower than the first voltage V L , it outputs a signal of low voltage with 1 Hz frequency and maximum 5V pulse voltage so as to make a buzzer generate alarm sounds with 1 Hz frequency.
- the method includes the following steps:
- a method for power management of battery includes the following steps:
- the actuator unit 34 consists of a variable timer circuit 341 , an output controller 342 and a source cutoff and connection circuit 343 .
- the internal circuit of the variable timer circuit 341 is time set circuit composed by four sets of toggle switch in combination with four sets of resistance. By respective on/off of the four sets of toggle switch, there are 16 kinds of variable timing status.
- a sample of variable timing at half an hour interval is that the time is set from 15, 30 minutes to 7 hours and the switches are turned on at half an hour interval.
- the output controller 342 connects with the main battery 1 , the backup battery 2 , and the variable timer 341 and is disposed between the power management 333 and the over voltage protector 311 , as well as between the power management part 333 and the over voltage protector 311 .
- the output controller 342 outputs a signal to the source cutoff and connection circuit 343 so as to supply or cut off the power to the outside device 4 , or stops charging the main battery 1 or the backup battery 2 .
- the alarm/display unit 35 receive signals with various values and voltage to generate different display/alarm.
- the power management 333 when the power management 333 outputs a control signal to the output controller 342 , it also outputs high voltage with frequency of 1 Hz or 2 Hz. Through circuit of diode, the switch is closed to form a circuit so that a buzzer generates alarming sounds with frequency of 1 Hz or 2 Hz.
- the power management 333 When the power management 333 outputs a control signal to the output controller 342 , it also outputs various voltage signal for driving LED light sets of a display 351 . By various combinations of lighting of the LED light sets, it is learned that whether the main battery 1 and the backup battery 2 are full charge, abnormal, connection or cutoff, etc.
Abstract
Description
-
- Referring to the
FIG. 1 , wherein like reference numbers refer to like parts: - vehicle main battery 1: a set of 12VDC (direct current) lead-acid battery, nominal voltage Vp=12VDC, nominal current Ap=4 A;
- vehicle backup battery 2 : a set of 12VDC (direct current) lead-acid battery, nominal voltage Vp=12VDC, nominal current Ap=4 A
- vehicle generator: with electric starter provided charging current;
- connection of batteries: the connecting of the vehicle battery protect
device 3 with the vehicle power system is the vehicle battery protectdevice 3 connects in parallel with the positive poles of themain battery 1 and thebackup battery 2, while the vehicle battery protect device connects in series withoutside device 4;
(1) A Method for Battery Power Source Noise Pattern Analysis and Management the Battery of an Embodiment in Accordance with the Present Invention:
- Referring to the
- <1>: MPD1: installing or resetting the battery protection device in accordance with the present invention; MPD2: initializing and setting reference values of the battery protection device; MPD3: taking samples from signals;
- <2>: PD1 checking the sampled signals so as to learn whether the vehicle is on and the generator works normally; checking the battery to know whether the battery is normal and is beginning to charge;
- <3>: PD2 checking the vehicle so as to learn whether the vehicle stops and the battery is not charged;
- <4>: PD3 checking whether the main battery is exhausted;
- <5>: PD4 checking whether the backup battery is exhausted;
- <6>: processing power management and alarm/display.
- <1>: PD103 when the voltage of the main battery is higher than the third voltage value, an alarm/display showing abnormal voltage of the main battery is sent for reminding drivers that the might reason is output voltage of the vehicle generator malfunction;
- <2>: PD106 when the voltage of the main battery is lower than the first voltage VL, an alarm/display showing abnormal voltage of the main battery is sent for reminding drivers that the battery is in abnormal status;
- <3>: MPD4 when the voltage of the main battery is within normal range and the comparison result of the detected noise shows that the vehicle generator is normal and is able to charge the main battery as well as the backup battery, connect the present invention with the main battery and the backup battery;
- <4>: MPD6 when the voltage of the main battery is lower than the second voltage VH and the comparison result of detected signals shows there is no noise pattern, cut off power from the backup battery and start clocking according to set timing of a variable timer;
- <5>: MPD9 when the voltage of the main battery is lower than the first voltage VL or the time is up, connect the backup battery and take the step MPD10, cut off power output of the main battery;
- <6>: when the voltage of the backup battery is lower than the first voltage VL, take the step MPD11, cut off power from the backup battery;
- <7>: once external power consumption is over loading of the present invention or there is a short happened in outside electrics, output current is higher than limited current AR, take the step MPD11, cut off power from the backup battery for sake of safety and preventing the battery from ageing caused by power exhaustion.
- <1>: MPD2 calculate reference values of the third voltage VU, the first voltage VL, the second voltage VH, and the voltage noise variation VN;
- <2>: PD101-PD201-PD301-PD401 set sampling time of receiving each signal;
- <3>: in the step PD103, compare the battery voltage with the third voltage VU, if the battery voltage is higher than the third voltage VU, output a signal as well as alarm/display;
- <4>: in the step PD106, compare the battery voltage with the first voltage VL, if the battery voltage is lower than the first voltage VL, output alarm/display;
- <5>: in the step PD107, compare the battery voltage with the third voltage VU and the second voltage VH, if the battery voltage is lower than the third voltage VU while higher than the second voltage VH, output alarm/display;
- <6>: in the step PD108, compare the voltage noise variation VN with the frequency pattern according to voltage and noise. If it matches the pattern, output signals;
- <7>: in the step PD203, compare the battery voltage with the third voltage VU, if the battery voltage is higher than the third voltage VU, output signals as well as alarm/display;
- <8>: in the step PD206, compare the battery voltage with the second voltage VH, if the battery voltage is lower than the second voltage VH, continue receiving signals and checking;
- <9>: in the step PD207, compare the voltage noise variation VN with the frequency pattern according to voltage and noise. If it doesn't match the pattern, output signals;
- <10>: in the step PD303, compare the battery voltage with the first voltage VL, if the battery voltage is higher than the first voltage VL, continue receiving signals and checking;
- <11>: in the step PD403, compare the backup battery voltage with the first voltage VL, if the battery voltage is higher than the first voltage VL, continue receiving signals and checking;
- <12>: in the step PD404, compare the backup battery current with the limited amperage AR, if the backup battery current is higher than the first voltage VL, output signals;
(5) anActuator Unit 34 of an Embodiment in Accordance with the Present Invention:
Claims (17)
0.75×VP≦the first voltage VL≦0.95×VP
1.115×VP≦the second voltage VH≦1.120×VP
1.27×VP≦the third voltage VU≦1.32×VP
1.4×AP≦limited current AR≦1.75×AP.
0.70×VP≦the first voltage VL≦0.90×VP
1.113×VP≦the second voltage VH≦1.118VP
1.26×VP≦the third voltage VU≦1.30×VP.
100 mV˜2.4V≦the voltage noise variation VN≦150 mV˜4.8V.
100 mV˜2.4V≦the voltage noise variation VN≦150 mV˜4.8V.
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